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Bench Mark Sheet for 8723583, CARYSFORT REEF LIGHTHOUSE FL

Superseded Epoch

Large map location marker Station Location
Small red map location marker Published bench mark
Small blue map location marker Unpublished bench mark

Bench mark positions only appear on the map if their coordinates in the CO-OPS database are at the precision of degrees/minutes/seconds/and tenths of seconds. If the coordinates are less precise, the mark will not appear.

Printable version

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
Datums Page                                                        Page  1 of  6

                                                                                
Station ID: 8723583                         PUBLICATION DATE:  01/23/2004
Name:       CARYSFORT REEF LIGHTHOUSE                         
            FL
NOAA Chart: 11462                           Latitude:   25° 13.3' N (  25.22170)
USGS Quad:  CARD SOUND                      Longitude:  80° 12.7' W ( -80.21170)


To reach the tidal bench marks from Worlds Beyond Marina on Key Largo, proceed
by boat east for 10.8 km (6.7 statute mi) to Carysfort Reef Lighthouse.  The
bench marks are located on the collar connecting the horizontal braces of the
structure.  The tide gage and staff were located on the wooden boat dock.


                         T I D A L   B E N C H   M A R K S
                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  6

                                                                                
Station ID: 8723583                         PUBLICATION DATE:  01/23/2004
Name:       CARYSFORT REEF LIGHTHOUSE                         
            FL
NOAA Chart: 11462                           Latitude:   25° 13.3' N (  25.22170)
USGS Quad:  CARD SOUND                      Longitude:  80° 12.7' W ( -80.21170)


                         T I D A L   B E N C H   M A R K S


                 PRIMARY BENCH MARK STAMPING:   
                         DESIGNATION:          872 3583 BOLT 1
                         ALIAS:                NO STAMPING 1

MONUMENTATION:           Bolt                                  VM#:         5926
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Chiseled cross in bolt                OPUS PID:        
LATITUDE:   25° 13.3' N (  25.22170)          LONGITUDE:  80° 12.7' W ( -80.21170)


The bench mark is a chiseled cross in the westernmost bolt head at the top of a
collar connecting the horizontal brace with the first leg west of the boat dock,
11 m (35 ft) NW of bench mark NO STAMPING 2.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  6

                                                                                
Station ID: 8723583                         PUBLICATION DATE:  01/23/2004
Name:       CARYSFORT REEF LIGHTHOUSE                         
            FL
NOAA Chart: 11462                           Latitude:   25° 13.3' N (  25.22170)
USGS Quad:  CARD SOUND                      Longitude:  80° 12.7' W ( -80.21170)


                         T I D A L   B E N C H   M A R K S


                         BENCH MARK STAMPING:   
                         DESIGNATION:          872 3583 BOLT 2
                         ALIAS:                NO STAMPING 2

MONUMENTATION:           Bolt                                  VM#:         5927
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Chiseled cross in bolt                OPUS PID:        
LATITUDE:   25° 13.3' N (  25.22170)          LONGITUDE:  80° 12.7' W ( -80.21170)


The bench mark is a chiseled cross in the southernmost bolt head at the top of a
collar connecting a horizontal brace with the second leg SE of the boat dock,
7.38 m (24.2 ft) from the center of the light.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  6

                                                                                
Station ID: 8723583                         PUBLICATION DATE:  01/23/2004
Name:       CARYSFORT REEF LIGHTHOUSE                         
            FL
NOAA Chart: 11462                           Latitude:   25° 13.3' N (  25.22170)
USGS Quad:  CARD SOUND                      Longitude:  80° 12.7' W ( -80.21170)


                         T I D A L   B E N C H   M A R K S


                         BENCH MARK STAMPING:   
                         DESIGNATION:          872 3583 BOLT 3
                         ALIAS:                NO STAMPING 3

MONUMENTATION:           Bolt                                  VM#:         7487
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Chiseled cross in bolt                OPUS PID:        
LATITUDE:   25° 13.3' N (  25.22170)          LONGITUDE:  80° 12.7' W ( -80.21170)


The bench mark is a chiseled cross in the southwesternmost bolt head at the top
of a collar connecting a horizontal brace with the third leg SE of the boat
dock, 6 m (19 ft) SW of bench mark NO STAMPING 1.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  5 of  6

                                                                                
Station ID: 8723583                         PUBLICATION DATE:  01/23/2004
Name:       CARYSFORT REEF LIGHTHOUSE                         
            FL
NOAA Chart: 11462                           Latitude:   25° 13.3' N (  25.22170)
USGS Quad:  CARD SOUND                      Longitude:  80° 12.7' W ( -80.21170)


                            T I D A L   D A T U M S 


Tidal datums at CARYSFORT REEF LIGHTHOUSE based on:

     LENGTH OF SERIES:      1 MONTH
     TIME PERIOD:           July 1975 - July 1975
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8723170 MIAMI BEACH (CITY PIER)


Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:

     MEAN HIGHER HIGH WATER                     MHHW   =  0.776
     MEAN HIGH WATER                            MHW    =  0.754
     MEAN TIDE LEVEL                            MTL    =  0.405
     MEAN SEA LEVEL                             MSL    =  0.404
     MEAN LOW WATER                             MLW    =  0.056
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     872 3583 BOLT 1                             3.200    2.446
     872 3583 BOLT 2                             3.201    2.447
     872 3583 BOLT 3                             3.205    2.451


                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  6 of  6

                                                                                
Station ID: 8723583                         PUBLICATION DATE:  01/23/2004
Name:       CARYSFORT REEF LIGHTHOUSE                         
            FL
NOAA Chart: 11462                           Latitude:   25° 13.3' N (  25.22170)
USGS Quad:  CARD SOUND                      Longitude:  80° 12.7' W ( -80.21170)


                             D E F I N I T I O N S


Mean Sea Level (MSL) is a tidal datum determined over a 19-year National Tidal
Datum Epoch.  It pertains to local mean sea level and should not be confused
with the fixed datums of North American Vertical Datum of 1988 (NAVD88).

NAVD88 is a fixed datum derived from a simultaneous, least squares, minimum
constraint adjustment of Canadian/Mexican/United States leveling observations.
Local mean sea level observed at Father Point/Rimouski, Canada was held fixed as
the single initial constraint.  NAVD88 replaces NGVD29 as the national
standard geodetic reference for heights.  Bench mark elevations relative to
NAVD88 are available from NGS through the World Wide Web at 
National Geodetic Survey.

NGVD29 is a fixed datum adopted as a national standard geodetic reference for
heights but is now considered superseded.  NGVD29 is sometimes referred to as
Sea Level Datum of 1929 or as Mean Sea Level on some early issues of Geological
Survey Topographic Quads.  NGVD29 was originally derived from a general
adjustment of the first-order leveling networks of the U.S. and Canada after
holding mean sea level observed at 26 long term tide stations as fixed.
Numerous local and wide-spread adjustments have been made since establishment in
1929.  Bench mark elevations relative to NGVD29 are available from the National
Geodetic Survey (NGS) data base via the World Wide Web at 
National Geodetic Survey.

NAVD88 and NGVD29 are fixed geodetic datums whose elevation relationships to
local MSL and other tidal datums may not be consistent from one location to
another.

The Vertical Mark Number (VM#) and PID# shown on the bench mark sheet are unique
identifiers for bench marks in the tidal and geodetic databases, respectively.
Each bench mark in either database has a single, unique VM# and/or PID# assigned.
Where both VM# and PID# are indicated, both tidal and geodetic elevations are
available for the bench mark listed. The NGS's Integrated Data Base (IDB PID)
provides geodetic datum based on traditionally leveled and bluebooked ties to
the National Spatial Reference System(NSRS) https://www.ngs.noaa.gov/datasheets/.
The NGS Online Positioning User Service (OPUS PID) provides geodetic datum based
on GPS position & tie it to the NSRS https://www.ngs.noaa.gov/OPUS/.

The NAVD88 elevation is shown on the Elevations of Tidal Datums Table Referred
to MLLW only when two or more of the bench marks listed have NAVD88 elevations.
The NAVD88 elevation relationship shown in the table is derived from an average
of several bench mark elevations relative to tide station datum.  As a result of
this averaging, NAVD88 bench mark elevations computed indirectly from the tidal
datums elevation table may differ slightly from NAVD88 elevations listed for
each bench mark in the NGS database.

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Products available at 8723583 CARYSFORT REEF LIGHTHOUSE, FL

Revised: 10/15/2013
NOAA / National Ocean Service
Web site owner: Center for Operational Oceanographic Products and Services